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- W4296301871 abstract "TIM4 has previously been associated with antitumor immunity, yet the pattern of expression and the function of this receptor across human cancer tissues remain poorly explored. Here we combined extensive immunolabeling of human tissues with in silico analysis of pan-cancer transcriptomic data sets to explore the clinical significance of TIM4 expression. Our results unveil that TIM4 is expressed on a fraction of cavity macrophages (CATIM4+MΦ) of carcinoma patients. Moreover, we uncover a high expression of TIM4 on macrophages of the T-cell zone of the carcinoma-associated tertiary lymphoid structures (TLSTIM4+MΦ). In silico analysis of a pan-cancer data set revealed a positive correlation between TIM4 expression and markers of B cells, effector CD8+ T cells, and a 12-chemokine signature defining tertiary lymphoid structure. In addition, TLSTIM4+MΦ were enriched in cancers displaying microsatellite instability and high CD8+ T-cell infiltration, confirming their association with immune-reactive tumors. Both CATIM4+MΦ and TLSTIM4+MΦ express FOLR2, a marker of tissue-resident MΦ. However, CATIM4+MΦ had a higher expression of the immunosuppressive molecules TREM2, IL10, and TGFβ as compared with TLSTIM4+MΦ. By analyzing a scRNA sequence data set of tumor-associated myeloid cells, we identified two TIM4+FOLR2+ clusters coherent with CATIM4+MΦ and TLSTIM4+MΦ. We defined specific gene signatures for each subset and found that the CATIM4+ MΦ signature was associated with worse patient survival. In contrast, TLSTIM4+MΦ gene signature positively correlates with a better prognosis. Together, these data illustrate that TIM4 marks two distinct macrophage populations with distinct phenotypes and tissue localization and that may have opposing roles in tumor immunity." @default.
- W4296301871 created "2022-09-19" @default.
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- W4296301871 date "2022-09-19" @default.
- W4296301871 modified "2023-10-18" @default.
- W4296301871 title "A Population of TIM4+FOLR2+ Macrophages Localized in Tertiary Lymphoid Structures Correlates to an Active Immune Infiltrate Across Several Cancer Types" @default.
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- W4296301871 doi "https://doi.org/10.1158/2326-6066.cir-22-0271" @default.
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